Flexible hydraulic waterproof compound.



COATING R PLASTIC. Cm83 R ference stra'rn r amnntr dame ALFRED F. LESTER, OI DETROIT, IICHIGAN.

"ILEXIBLE HYDRAULIC WATERPROOF COMPOUND.

1,157,231; Specification of Letters 2mm. Patented Oct. 19, 1915.

I0 Drawing. Application fled lay 1B, 1914. Serial Io. 889,278.

To all whom it may concern: be towed into dry-dock. The hardened mix- Be it known that I, Amman F. Lnsr m, a ture yields with the movement of the plates citizen of the United States, and a resldent of the ships bottom, and does not crack as 55 of Detroit, in the county of Wayne and do the compounds now commonly used.

5 State of Michigan, have invented a new and It will be understood, of course, that the Improved Flexible Hydraulic Waterproof g'oportions of the various ingredients may Compound, of which the following is a varied somewhat, but I prefer substanspecification. .tlally the relative amounts" stated. It may 60 This invention relates to a mixture which be found desirable, in some cases, to use a will harden rapidly in water, and which, small quantity of some substance, such as when hardened, becomes flexible and waterof c e m of tartar or commo proof; and it consists in the combinations sa or retar m e ar emng om of substances hereinafter described and ture, 1n order to give the user more time to 65 claimed. In the preparation of this mixwork It into the proper position. While I ture, I preferably first mix heat' fio or have specified and prefer shnipaed wood as other starch mate ,with owderedghya bondmg means, I have oun at as s 0s 7 drate'b me su stantially t%-prb'po n and other substances may be used. of one tab poonful of the former to five These and various other changes I regard 70 ounds of the latter, both of these substances as wlthln the splrlt of my invention, and do ing dry. To this mixture, which constinot, therefore, wish to be lim ted otherwise tutes substantially 1% of the whole, I prefthan as indlcated by the sub3o1ned claims. erably add the following ingredients in the I o1a1m: roportions indicated (by weight): of 1- A flexlble hydrauhc waterproof oomii draulic cement. preferably. rt and l Pound c mprlsmg substantlally forty parts zswdered sum l o of hydraulic cement, thlrty-two parts of H w d a I 0 h d powdered gypsum, twenty parts of poww 1-...- 0 o a binder such as dered ca cm d psum, one part of pow- H ft r whi h th whol i indered hydrate o lune, and four parts of in any desired way. In cases fire lay- 0 30- ;where any doubtexists as to the dryness of flexlble hydraul1c waterproof comthe elements, I preferably warm them to a Pound pr smg s stantlally forty per low degree, 200 renheit t d i cent. of hydraulic cement, thirty-two per off the moisture. 4 1s mixture is to cent. of powdered gypsum, twenty per cent.

be used, enough water is added to form a of p w d cfilclned gyp um, ne per cent. 35 thick aste whicB may be spread undgr of powdered hydrate 0f hme, 0111 per cent.

water with a trowel over foundation Walls, Of j l y, and three per cent of a fibrous or the sides of cofler dams to close cracks ndlng substance.

and small holes and thereby render the A e ydrauhc w proof comstructure watertight. It isespecially adaptpound mp g substantmlly forty p r 40 ed for use in the salvage of wrecks, in closcentof WEEK, thirty-two per ing holes in ships bottoms, in which case it cent of P ere .gyp g;tw nty per cent.

may be either run down through a pipe to of Powdered fllcllled fill molds built around the holes, or may be of POWdered h dumped into the space between the bottom of fire an 45 of the ship and the bed of the lake or river, WOOdand then worked by a diver into such posi E pnony whereof I have signed this tions as to entirely fill the hole in the botspe lficatlon 1 the presence of two SIIbSCIlba tom. The fact that it hardens rapidly (usug wl nesses,

' ALFRED F. LESTER.

ypsum, one per cent. umgl our per cent.

/ ree per cen of hreddgd ally in about forty minutes) and yet rei -50 mains flexible, renders it of particular value Witnesses:

in floating stranded or sunken Shlps and L. M. Smear, keeping them above water until they may Hueo W. Knnmmuxo.

copies of this patent may be obtained for five cents each, by addressing the "commissioner of ratents.

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